package com.example.demo.intercepotor;

import lombok.extern.slf4j.Slf4j;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * @ClassName: LoginInterce
 * @Description: 登录检查
 *  1. 配置好拦截器要拦截哪些请求
 *  2. 把这些配置放在容器中
 * @Author: 12071
 * @Date: 2021/4/11 15:27
 */
@Slf4j
public class LoginInterceptor implements HandlerInterceptor {


    /**
     * 目标方法执行之前
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String requestURI = request.getRequestURI();
        log.info("拦截的路径是{}",requestURI);

        //登录检查逻辑
        HttpSession session = request.getSession();
        Object loginUser = session.getAttribute("loginUser");
        if(loginUser != null){
            //放行
            return true;
        }

        //拦截
        session.setAttribute("msg","请先登录");
        response.sendRedirect("/");

//        request.setAttribute("msg","请先登录");
//        request.getRequestDispatcher("/").forward(request, response);
        return false;
    }

    /**
     * 目标方法执行完成之后
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    /**
     * 页面渲染之后
     * @param request
     * @param response
     * @param handler
     * @param ex
     * @throws Exception
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}
